Via the WSJ, in a federal complaint filed last Friday in the Northern District of California, Apple asked for an injunction preventing Amazon from using the "app store" name, plus unspecified damages. Amazon spells it "Appstore," but Apple apparently thinks that's close enough.

"Consumers of mobile software downloads are likely to be confused as to whether Amazon's mobile software download service is sponsored or approved by Apple," Apple said in its complaint, via the WSJ.

Given the relationship between the companies -- increasingly competitive, but Amazon sells a lot of Apple products, and Apple has licensed its "one click" e-commerce technology -- you'd have to assume something like this went all the way to the top at both companies.

Anyway, if Amazon does have to stop using the "app store" name, what will it choose? RIM uses "App World" for the BlackBerry, Palm uses "App Catalog" for webOS, Google uses "Market" for Android, and so on. Or will Apple and Amazon figure this out without a judge?

And how does this affect other negotiations the companies may be having, such as whether Apple is really going to try to tax Amazon 30% for Kindle e-books sold through Amazon's iOS apps?